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Abstract

Objective
To determine the outcome of percutaneous nephrolithotomy (PNL) in patients of renal stones with varied body mass index (BMI).
Study design
Cross sectional study.
Place & Duration of study
Department of Urology and transplantation, Jinnah Postgraduate Medical Center (JPMC), Karachi, from February 2019 to April 2020.
Methodology
Patients of renal stones were divided into four groups according to the BMI; underweight, normal weight, overweight and obese subjects. CT KUB was done in all patients to determine the size and site of the stone in renal unit. All patients underwent PNL. All had urine C/S to document infection in perioperative period. Postoperative complications were also noted. Patients were followed for six weeks with x-ray KUB to detect the presence of radio opaque stone or ultrasound demonstration of radiolucent stone to estimate frequency of stone free rate. Data were entered and analyzed by SPSS 21.0 version. A p value of less than 0.05 was considered as significant after applying Chi square test.
Results
A total of 133 patients were included in the study. Mean age of the patients was 51.9±8.2 year and mean body mass index 28.9±5.5 kg/m.2 There were 76 (57.1%) male and 57 (42.9%) female patients. Mean size of the stone was 2.4±0.4 cm, mean operative time was 67.3±22.5 minutes and mean fluoroscopy time was 55.2±11.4 seconds. Two (1.5%) patients were under weight, 6 (4.5%) of normal weight, 34 (25.6%) overweight and 91 (68.4%) were obese. Stone clearance was noted in 77 (57.9%) patients while stone clearance with respect to BMI was insignificant (p=0.592). Fever was documented in 22 (16.5%) patients and hematuria in 34 (25.6%) patients.
Conclusion
Stone clearance after PNL did not depend upon BMI of the patients. PNL is safe and effective treatment modality in obese patients with acceptable postoperative complication rate.
Key words
Renal Stone, BMI, PNL, Stone clearance.